* {
  padding: 0;
  margin: 0;
  list-style: none;
  text-decoration: none;
}

.box {
  position: relative;
  margin: 0 auto;
  width: 500px;
  height: 200px;
  /* border: 1px solid black; */
  overflow: hidden;

}
.box > .img_box > ul {
  font-size: 0px;
  white-space: nowrap;
  transition: 0.2s ease-in-out;
  transform: translate(-100%);
}
.box > .img_box > ul > li {
  width: 500px;
  height: 200px;
  display: inline-block;
  
}
/* 激活类名, 显示li */
.box > .img_box > ul > li > a > img {
  width: 500px;
  height: 200px;
}

/* 左右箭头 */
.box > .img_box .arrow_left,
.box > .img_box .arrow_right {
  font-size: 30px;
  cursor: pointer;
  background-color: gray;
  color: #fff;
  width: 30px;
  text-align: center;
  opacity: 0.6;
}

.box > .img_box .arrow_left:hover,
.box > .img_box .arrow_right:hover {
  background-color: #000;
  opacity: 0.4;
}

.box > .img_box .arrow_left {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  left: 0px;
}

.box > .img_box .arrow_right {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  right: 0px;
}

/* 小圆点 */
.box > .dot_box {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
}

.box > .dot_box > span {
  display: inline-block;
  width: 12px;
  height: 2px;
  border: 2px solid #000;
  margin: 0 8px;
  cursor: pointer;
  background-color: #fff;

}
.box > .dot_box > span:hover {
  background-color:darkseagreen;

}
.box > .dot_box   .dotActive{
  background-color:darkseagreen;

}

